Basic knowledge about hinges

About Hinges

Hinges allow doors and flaps to open and close.
In general hinges consist of 2 leaves and are held together by a pin which is the rotational center for the hinges.

About Hinges

Hinges are everywhere

Imagine a world without hinges! Doors wouldn't open. You would have to break your door every time you entered or exited.

They are used on not only doors but also used in many different applications. For example, they are necessarily used in covers of piano keyboards, toilet seats, lap tops, cell phones, and more.

Hinges are everywhere

Parts of hinges

Common parts of hinges are shown in the picture below.
Hinges comprise two main parts, "leaf" and "pin". The leaves rotate around the pin which is the rotational center for the hinges.

Parts of hinges

How are hinges made?

A hinge begins with a large sheet of steel.
Firstly, it is cut into the required size. This process is called shearing.
Secondly, the plate is put into a die and is punched and struck into two leaves. After that, holes are made by drilling.
From there, the edges of the leaves are put under great pressure to bend them into their final shape. Finally, a pin is inserted through the knuckles.

How are hinges made?

Types

There are many different types of hinges. By knowing that, you can find appropriate hinges matching your desired applications.

Here is the list of common hinges.

Types Pictures Descriptions
Butt Hinges LSB

LSB

Butt Hinges are used most commonly.
Piano Hinges LSN

LSN

Piano Hinges have long and narrow leaves.
It is highly recommended to use hinges which are comparative in size to the doors they are being used on. Not only is it standard practice but it is also a way to reinforce the security features of the door.
Lift-Off Hinges KN

KN

HG-KH

HG-KH

Lift-Off Hinges consist of two detachable leaves.
They are easy to install because the door does not need to be held in position when installing.
Spring Hinges HG-SHL

HG-SHL

DA

DA

Spring Hinges are used to keep doors or flaps closed or open by the force of springs.
Concealed Hinges
European Hinges
J96

J96

H96TSH

H96TSH

Concealed Hinges (European Hinges) are most common in furniture. They have multiple axes of rotation which enables doors to move in a variety of novel ways. This can be used to open in small radius and in other unconventional ways.
They are mainly used on wooden cabinet. However, they have recently begun to be used in machine industry.
Sugatsune's Concealed Hinges (European Hinges) are come in many different functionalities including 3 way adjustability, clip-on feature, damper, and more.
Concealed Hinges HES3D-121

HES3D-121

R

R

Concealed Hinges are hidden from view when doors or flaps are in a closed position, That allows for clean appearance. The ability to adjust the position in three different dimensions after installation is becoming a household standard with concealed hinges.
Torque Hinges HG-TS

HG-TS

HG-DTB

HG-DTB

Torque Hinges hold doors or flaps in any position by force of friction. They are also used in monitors in order to adjust the angles. For more information, click here.
Damper Hinges HG-JH

HG-JH

UDH-17

UDH-17

Damper Hinges allow doors or flaps to close slowly.
The built-in viscous liquid works as shock absorber. They are also used in toilet seats.
For more information, click here.
Lift Assist Hinges HG-PA201

HG-PA201

The built-in spring allows doors or flaps to be opened lightly. For more information, click here.
Detent Hinges HG-MPS3

HG-MPS3

MPH3

MPH

Detent Hinges hold doors or flaps at certain positions without secondary support. They are often used in flip phones, For more information, click here.
Glass Door Hinges GH-34-9

GH-34-9

M8501

M8501

Glass Door Hinges come in many different types. Some of them require glass to be processed, and others do not.
Gravity Hinges XL-GH05-121

XL-GH05-121

Gravity Hinges are automatically open or close by using the weight of the door as a constant force. They are often used in bathrooms.
Pivot Hinges PL-66

PL-66

HG-PV61AC

HG-PV61AC

Pivot Hinges are attached at the bottom and top of the door. They are called Pivot Hinges because the axis of rotation is on the outside of the door, making doors or flaps open in a slightly unconventional way.
Drop Hinges SDH-P

SDH-P

Drop Hinges are used in downward opening flaps like TV racks. The notable feature is that flaps become flush with the cabinets when fully opened.
Clean Room Hinges HG-CV

HG-CV

Clean Room Hinges have plastic bushings between the knuckles They prevent metal-to-metal contact and minimize particles. They are designed to be suitable for use in clean rooms and laboratories.

How to install hinges

  • When installing hinges, it is important to maximize the distance between their placement. This works to decrease load capacities and prevent doors from sagging.
      * In the case of Piano Hinges, it is best practice for Piano Hinges and doors to be the same length.
      * In the case that more than two hinges are used, equalize and maximize the distance between hinges when installing.
How to install hinges